Listview项目未显示弹出菜单

Question

我的listview项目也没有显示弹出菜单，它们没有被点击..这是我的代码，我需要帮助。

public class AddMovieToList extends AppCompatActivity {
    MovieDbHelper helper;
    MyListAdapter adapter;
    ListView myDataList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        helper = new MovieDbHelper(getApplicationContext());
        setContentView(R.layout.activity_addtolist);


        myDataList = (ListView) findViewById(R.id.addToList_listView);

        ArrayList<MovieModel> getInfos = helper.getMovieInfo();

        myDataList.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
                PopupMenu popupMenu = new android.widget.PopupMenu(getApplicationContext(),view);
                popupMenu.getMenuInflater().inflate(R.menu.popup_menu, popupMenu.getMenu());
                popupMenu.show();
                return true;
            }
        });

        if(adapter == null){
            adapter = new MyListAdapter(getBaseContext(),R.layout.addlist_layout_type,getInfos);
            myDataList.setAdapter(adapter);
        }else{
            adapter.clear();
            adapter.addAll(getInfos);
            adapter.notifyDataSetChanged();
        }
    }